Rolling-mill.



V. A. SALTER.

ROLLING MILL.

APPLxcATloN FILED 1AN.\7,1916.

INVENTOR.

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W. A. SALTER.

- RoLLxNG MrLL.

APPILlCATIDN FILED JAN. I7, i916.

1,206,381. patented Nov.- 28, 1916,

3 SHEETS-SHEET 2.

WI TNESSES: I N V EN TOR.

w. A. SALTER.

ROLLING MILL.

APPLICATION FILED .IAN.17, I916.

Patented Nov. 28, 1916.

3 sHEETssHEET 3.

Lwsl.

IN VEN TOR.

sideshape of them conforming to the exterior profile lines of the gun orordnance barrel being formed and they have at their larger end anintegral flange that overlaps the end of the barrel, and preventsendwise drawing of the barrel during rolling,

operations. They also haXe extended integral shaft bearings, which areextended at the larger end to provide a driving means through theuniversal joints 12 and 12. These rolls 3 and 8 are journaled in thebearings 6 and 6 and 7 and 7 and are operated `through the pressurelevers 8 and 8 at the rear end by means of the hand wheel 18, and theright and left hand threaded screw 14 and the nuts 15 and 15', and atthe front end of the machine the rolls 3 and 3 are operated by means oftlie pressure levers 9 and 9 and the pressure cylinder 16.

The bearings 6 and 6 and 7 and 7 carry the ends of the rolls 3 and 3 andslide adjustably in the` slots provided for them in the supporting bases1 yand 2 and the centers of the bearings are in line with the centers ofthe centering members 4 and 5.

The operating levers 8 and 8 are driven by means of the circular facednuts 15 and 15 and the right and left hand threaded screw 14 by `meansof the hand wheel 13 for applying pressure on the smaller end of therolls 3 and 3', these levers being hinged to pins in the base 1 at theirlower ends, and their upper ends being connected with the bearings 6 and6.

The operating levers 9 and 9 are joined at their upper ends by means ofthe shackle bar 9 and pivoted to the bearings 7 and 7 and between theirIlower ends is hung the pressure cylinder 16 and its connecting rod 17and piston 18 through which pressure is applied to the larger ends ofthe rolls 3 and 3.

The hollow centering members 4 and 5 are journaled inthe bosses of thebases 1 and 2. and have endwise movement to conform to the length ofbarrel being rolled, and endwise pressure is applied upon them throughthe levers 1l) and 10 connected together by the rod 11 by means of thepressure cylinder 19 and its piston 19 and connecting rod 19". Thesehollow` centers are tapered at their inner ends so'as to lit in beveledges of the bore of the barrel to receive them and make a close litbetween them and the barrel, and they also haveintegral flanges 2Q and20 for transmitting the pressure exerted by the levers 10 and "10',through the medium of the ball bearings 21 and 21.

The centering member 5 at the larger ends of the rolls 3 and 3 is hollowthroughout its length, and at the outer end fits into the hollow elbow22 in which it is free to turn and slide axially. This hollow elbow 22is connected by a pipe to the cooling element, the How o`f which iscontrolled by the valve 23, and the packing gland 24 prevents the escape`of the cooling clement around thc joint of the centering member 5.

Compressed air or ,/steam is obtained through the pipe 25 and isadmitted through the valve 2G and tubing 27 to the cylinder 19 forgiving endwise pressure on the cen tering members 4 and 5, andcompressed air or steam is admitted through the throttle valve 28 and`ifour wayvalve 29 and the flexible tubes 30 and. 30 to the ends of thepressure cylinder 16, for operating and giving the required degree ofpressure on the larger ends of the rolls 3 and 3 the operator in chargeof the machine being -guided by the pressure gage 31.

In operation, I take advantageof the fact that steel, 'when heated to ared or forging heat, expands considerably over what it was in a coldstate, and shrinks in cooling to the same degree, and also while it isin a red or white stage of heat, steel adapts itself to forgingoperations by blows from hammers, .rollers under pressure or constantheavy pressure. Also when a piece of steel is heated to a white or redheat to where it is in a forging state, and a strong cooling element isbrought in contact with one side of it, that side will chill rapidly andthe cooled portion travel slowly across the steel untilthe entire pieceis cooled.

So in'v the operation ,of my invention I first machine and bore the gunor ordnance vbarrel to be treated to approximately its cormaticallyadapt themselves to expansions and contractions of the barrel whilebeing worked. Bearings 6 and 6 are now tightened against the rear end ofbarrel B by turning the handA wheel 13, and a light lpressur@l ofcompressed air or steam is admitted' to the lcylinder 16 through thethrottle28- bringing the front end of the rolls lightly against thebarrel 13, and power is applied to the rolls 3 and 3 through\anysuitable means that will drive them in the Same direction of rotation,thus turning the barrel B between them, and the centering members 4 and5 rotate with the barrel, theball4 bea-rings 21 aud21 allowing them thusto turn and'at the same time maintaining the endwise pressure from the'cylinder 19. With the rolls 3 and 3 now turning with the barrel 13, thevalve 23 is now opene'd\13 admitting the cooling element to low throughthe bore of the heated barrel, coming in through the centering member 5and out through the centering member 4 to discharge, and as soon as thebore of the barrel commences to cool, forming a core of chilled steel inthe .center or' the barrel, additional pressure is admitted through thevalve 28 to the cylinder 16, thus'increas'ing the pressure on the rolls3 and 3 and forcing the hot outside parts of the barrel .B down onto thechilled core interior, and as the cooled portion of the steel barreltravels slowly outward, in this cooling process each automatic part ofthe hot steel is rolled down against and shrinks on and compresses thatpart lying immediately next to it toward the bore. -The result of thefinished barrel being that each part of the barrel, is in a state ofuniform tense compression against the bore to resist the forces ofexplosion, when in use.

Operation of the valves 26 and 29 releases the compression in cylinders16 and 19, spreading the centering menibers and rolls apart, :tordisengaging the barrel B.

I claim as my invention and desire to secure by Letters Patent: I

1. In an ordnance rolling mill, the combination of a multiplicity ofrolls, and hollow adjustable 'centers contiguous to the ends of therolls.

2. In an ordnance rolling mill the combination of a multiplicity ofrolls, hollow adjustable centers contiguous to the rolls and adapted toconvey a cooling element, and yielding constant pressure connectionbetween the centers.

3. In an ordnance rolling mill, the coml,

means to convey cooling element connectedto one of the centers and meansfor controllso bination of a multiplicity 'of rolls, hollow` bination ofa multiplicity of rolls,'hollowadjustable centers, a means -to conveycooling element connected .with one of the centers, means forcontrolling the flow of the cooling element, and means for varying'thepressure on the rolls.

7. In an ordnance rolling mill, the com bination of a. multiplicity oftapered rolls, a hollow center contiguous to the larger ends of therolls, means for controlling the position of the center, and means forapplying pressure to the rolls.

8. In an ordnance rolling mill, the combination of a multiplicity oftapered rolls having a flange at their larger ends a holf low adjustablecenter, means to" convey a cooling element connected with the center,means for controlling the flow of thecooling element, and means forapplying pressure to the rolls. 9. In an vordnance rolling mill, thecombination of a multiplicity of tapered rolls having flanges at theirlargerends, hollow adjustable centers contiguous to th'e ends ofvthevrolls, means to convey a cooling element connected with one of thecenters, means for applying endwise pressure to the centers,

10. In an ordnance rolling mill, the comy bination of a multiplicity oftapered rolls having flanges at their larger ends, hollow centerscontiguous tothe ends of the rolls,

.means to convey a cooling element connected with one of the centers,and a yielding pressure connection between the centers, and means forapplying variable pressure to the rolls.

In testimony whereof, I have signed my name to thisv specification inthe presence of two subscribing witnesses.

IVILLIAM A. SALTER lVitnesses:l

C.- SALTER, M. A.. SALrnlc.

